The first VLBI detection of the secular aberration drift
| Autor: | Titov, O. A., Lambert, Sébastien |
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| Přispěvatelé: | Geoscience Australia, Systèmes de Référence Temps Espace (SYRTE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Systèmes de référence célestes, Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Alef, Walter, Bernhart, Simone, Nothnagel, Axel, Henry, Florence, Alef, Walter, Bernhart, Simone, Nothnagel, Axel |
| Jazyk: | angličtina |
| Rok vydání: | 2011 |
| Předmět: | |
| Zdroj: | Proceedings of the 20th European VLBI Group for Geodesy and Astrometry (EVGA) Working Meeting 20th Meeting of the European VLBI Group for Geodesy and Astronomy, held in Bonn, Germany, March 29-30, 2011, Eds: W. Alef, S. Bernhart, and A. Nothnagel, Institut für Geodäsie und Geoinformation, Rheinischen Friedrich-Wilhelms-Universität Bonn, p. 171-173 20th Meeting of the European VLBI Group for Geodesy and Astronomy, held in Bonn, Germany, March 29-30, 2011, Eds: W. Alef, S. Bernhart, and A. Nothnagel, Institut für Geodäsie und Geoinformation, Rheinischen Friedrich-Wilhelms-Universität Bonn, p. 171-173, Jul 2011, Bonn, Germany. pp.171-173 |
| Popis: | International audience; Analysis of VLBI records of distant radio source signals allows to determine the proper motions of the extragalactic objects with an accuracy of a hundred microseconds of arc per year (muas/yr). Such an accuracy is sufficient to investigate the aberration in proper motions of distant bodies due to the rotation of the Solar system barycentre around the Galactic centre. We analyzed geodetic and astrometric VLBI data to produce radio source coordinate time series using the CALC/SOLVE software package. We fitted vector spherical harmonic components of degree 1 and 2 to the velocity field made up of the proper motions of 555 sources of good observational history over the period 1990-2010. The acceleration vector has an amplitude of 6.4 /-1.5 muas/yr and is directed towards equatorial coordinates alpha=263° and delta=-20°. Within errors bars, the magnitude and the direction of the dipole component agree with predictions (magnitude 4-6 muas/yr, alpha=266° and delta=-29°). |
| Databáze: | OpenAIRE |
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